{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "aae88dd5",
   "metadata": {},
   "source": [
    "#### 看起来像复制，但其实不是"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "a3b48fce",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "first = [1,2,3,4,5]\n",
    "first"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "fbf38068",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "second = first\n",
    "second"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "96fb24aa",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5, 6]"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "second.append(6)\n",
    "second"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "5fd11ced",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5, 6]"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "first"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c55147ae",
   "metadata": {},
   "source": [
    "#### 如何复制一个数据结构"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "cd502410",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5, 6]"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "third = second.copy()\n",
    "third"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "599d42e3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5, 6, 7]"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "third.append(7)\n",
    "third"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "814733ee",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 4, 5, 6]"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "second"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b9824912",
   "metadata": {},
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.8"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}
